Catalytic C–H Activation of Phenylethylamines or Benzylamines and Their Annulation with Allenes
摘要:
Tetrahydro-3-benzazepines and tetrahydroiso-quinolines are synthesized in one,step from allenes and phenylethylamines or benzylamines,Mechanitically, it is assumed that activation of an aromatic ring with Pd(II) occurs, directed by the primary amine, leading to the formation of a palladacycltinto which'ari, allene then undergoes insertion. The resulting, pi-allyl intermediate cyclizes to the products by aniptramolecular allylic alkylation. The process is particularly useful with 2,3-butadienoates and amines having a quaternary carbon at the alpha-position.
Intramolecular meta photocycloaddition of conformationally restrained 5-phenylpent-1-enes. Part II: Steric and electronic effects caused by 4-mono- and 4-disubstitution
作者:Helma M. Barentsen、Alex B. Sieval、Jan Cornelisse
DOI:10.1016/0040-4020(95)00374-h
日期:1995.7
derivatives always prefer 2,6 addition, independent of the size of the substituent. For 2,6 addition two basic conformations are possible. Disubstituted compounds yield predominantly 1,3 addition with the sterically more demanding group exo. Except for the methoxymethyl and THF derivative the oxygen is found exo as a result of repulsion, while the monohydroxy derivative gives also endo which might be explained
Clay cation complexes and their use to increase viscosity of liquid
申请人:NL Industries, Inc.
公开号:US04434076A1
公开(公告)日:1984-02-28
An organophilic clay gellant comprising the reaction product of an organic cationic compound and a smectite-type clay having a cation exchange capacity of at least 75 milliequivalents per 100 grams of said clay, wheein said organic cationic compound contains (a) a first member selected from the group consisting of a .beta., .gamma.-unsaturated alkyl group, and a hydroxyalkyl group having 2 to 6 carbon atoms, and mixtures thereof, (b) a second member comprising a long chain alkyl group having 12 to 60 carbon atoms and (c) a third and fourth alkyl member.
Smoking compositions incorporating a menthol-release agent
申请人:Philip Morris Incorporated
公开号:US04002179A1
公开(公告)日:1977-01-11
This invention relates to novel oligomers and polymers produced from monomer carbonate esters of menthol having the formula: ##STR1## These compounds find particular use as menthol-release agents which will impart improved aroma, flavor, and taste effects to natural and reconstituted smoking products.